python3 使用smtplib发送邮件错误554

python3使用smtplib和MIME发送邮件失败

代码：

from smtplib import SMTP
from email.mime.text import MIMEText
from email.header import Header

def send_email(SMTP_host, from_addr, password, to_addrs, subject, content):
    email_client = SMTP(SMTP_host)
    email_client.login(from_addr, password)
    # create msg
    msg = MIMEText(content,'plain','utf-8')
    msg['Subject'] = Header(subject, 'utf-8')#subject
    msg['From'] = 'main<xxxxx@163.com>'
    msg['To'] = "xxxxx@126.com"
    email_client.sendmail(from_addr, to_addrs, msg.as_string())

    email_client.quit()

if __name__ == "__main__":
    send_email("smtp.163.com","xxxxx@163.com","password","xxxxx@126.com","test","hellow")
    

运行错误：

Traceback (most recent call last):
...
  File "D:/bioinformatics/python脚本/mai.py", line 14, in send_email
    email_client.sendmail(from_addr, to_addrs, msg.as_string())
  File "D:\软件\python\lib\smtplib.py", line 799, in sendmail
    raise SMTPDataError(code, resp)
smtplib.SMTPDataError: (554, b'DT:SPM 163 smtp8,DMCowACX58anaFJX9+uwAA--.20172S2 1465018537,please see http://mail.163.com/help/help_spam_16.htm?ip=219.143.13.117&hostid=smtp8&time=1465018537')

在网上找了很多方法，把防火墙也关了，修改了发件人收件人名称，但还是没有效果，真的不知道是什么原因。。

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1) 检查下垃圾箱，确认邮件没有扔到垃圾箱里
2） from和To要跟内容一致，不要填不一致的，否则会被邮件服务器过滤。
下面代码亲测可以用163邮箱给QQ邮箱发邮件。

def send_email(SMTP_host, from_account, from_passwd, to_account, subject, content):
    email_client = SMTP(SMTP_host)
    email_client.login(from_account, from_passwd)
    # create msg
    msg = MIMEText(content, 'plain', 'utf-8')
    msg['Subject'] = Header(subject, 'utf-8')  # subject
    msg['From'] = from_account
    msg['To'] = to_account
    email_client.sendmail(from_account, to_account, msg.as_string())

    email_client.quit()
    
    
    

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最后终于还是找到解决办法了：
邮件主题为‘test’的时候就会出现错误，换成其他词就好了。。我也不知道这是什么奇葩的原因

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Error报的不是很清楚了吗:
从error里的链接: http://help.163.com/09/1224/17/5RAJ4LMH00753VB8.html

554 DT:SPM 发送的邮件内容包含了未被许可的信息，或被系统识别为垃圾邮件。请检查是否有用户发送病毒或者垃圾邮件；

你需要的是检查自己发的东西内容.